A pair of enterprising iOS developers have created a hack that allows iPhone and iPad apps, including Facebook and YouTube, to run on the Apple TV.
The second-generation media hub is essentially an iOS device, with an iPad-style A4 chip under the hood and a modified version of iOS 5 for its operating system. You can use AirPlay to stream video from a nearby iPhone or iPad but it doesn't have its own apps (yet).
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from Ars Technica http://arstechnica.com/index.php
